Hope you don't mind I ask after 1 year , I am going to install the metal roof. Did you use the Clip-lock version?

As for the insulation, my future house is facing afternoon sun. The contractor originally proposed a layer of woven fabric and double-sided aluminium foil. I think it is not sufficient. He then proposes the insulation foam. It appears that this sort of foam has 7 layers.

Did you install the solar-power roof ventilator?

Yes, my contractor suggested that and showed me the sample of the aluiminium foil and the rock wool.

The slope is 28% and he quoted metal lock, I presume it is a clipping system.

However, as DBKL cut away a tall and old tree, my house is fully exposed to the direct afternoon sun. Very hot and I am trying to look for double protection.

I have selected the vendor but have not installed yet. I am installing a local brand Astino with thickness 0.48mm click lock and the vendor's quotation includes

Light weight truss,
Small bubble foil,
50mm thk 40kg/m3 rockwool insulation,
600mm girth 0.47mm thk PPGI ridge capping,
fascia board (UAC Prima Plank cement board)
450mm girth 0.47mm thk PPGI gutter
600mm girth 0.47mm thk PPGI fire wall capping

Per sqft is about RM 24.50. Not sure if it is cheap or expensive.

I am going with clip lock 672. For this metal roof, I was told that there is no drilling and fastening.

https://www.astino.com.my/products/astino-r...p-lock-672-710/

If there is a drilling and fastening with screws, I was told that workmanship is critical and also the rubber washers need properly seat against the metal roofing panel. Otherwise, it will cause future leaking. About the noise and heat, I was told the rockwool and bubble foil should solve the problem. But, the neighbour may hear the noise or face the reflection. Hence, have to choose lighter color.

My immediate neighbour is using metal roof for her kitchen extension. I noted the color fading. But, his extension was done long time ago. There are several houses around me are also usng metal roof.

For my case, my area is about 1815 sqft. So, the total cost is around 44k.